Telegram client on MacOS sometimes displays text under spoiler as pseudo-braille characters. In such cases, if you share your screen or take a screenshot, the hidden text can be recovered!
Screenshots of photos work too, with one limit: an image hidden under a spoiler cannot be recovered, but a spoilered caption can. In the chat list Telegram renders that caption as pseudo-braille, and that is what this decoder reads.
Check examples:
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or upload your image:
Drag & drop image here or click to select
Detecting braille region...
Carefully compare the characters in the string with the characters from the green rectangles. If any characters were recognized incorrectly, correct them manually
Click to enlarge
Decoding...